恐龙生活在数百万年前。
为什么红杉在数百万年前的北美森林里较常见？
Why were redwood trees more prominent in the forests of North America millions of years ago?
现在的彼尔姆地区在数百万年前还属于彼尔姆海。
Many million years ago the territory of the present Perm region was occupied by the Perm Sea.
上一次发生在数百万年前的某事将再发生。虽然这次不会像上次一样被记得。
Something that last happened millions upon millions of years ago happens again. Though it's not as memorable as last time.
煤和石油内部的能量来源于太阳，这些煤和石油在数百万年前由植物堆积而成。
The energy in coal and oil came from the sun, stored there by the plants of millions of years ago.
科学家们将它称作“活化石”，因为它很可能在数百万年前最早的海洋形成时就已经生长繁盛。
Scientists call it a "living fossil" because it has probably been thriving since earliest oceans were formed millions of years ago.
科学家们将它称作“活化石”，因为它很可能在数百万年前最早的海洋形成时就已经生长繁盛。
Scientists call it a "living fossil" because it has probably been thriving since earliest oceans were formed millions of years ago.
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